GestureConverterTest: split tests for clearing after gesture ends

GestureConverter doesn't use its stored array of fake fingers
(mFakeFingerCoords) when making move gestures, so using move gestures to
check for the GESTURE_* axes being cleared won't reveal failures. We
still need to use move gestures to check that the classification is
reset properly, though (as any other gestures will have their own
classifications).

Bug: 283093437
Test: atest inputflinger_tests:GestureConverterTest
Change-Id: I1349dc72f4c3fe0a7da5d9f1e06affd0dc45da49